I am not sure if its a folk story or not but there is the "brown M&M" story that goes around for Architects as a good way to weed out qualified bidders.
Architects are responsible for providing 2 things to the bidders, drawings and the specs. the drawings are typically 24x36 pieces of paper, and the sets are usually a couple hundred pages to go thru. the specs are all the words that describe the products and procedures we want followed, and is typically several thousand pages long, 8.5x11.
the devil in the details is to slip in a requirement that the GCs must bring a bowl of M&Ms with only the brown M&Ms to the bid meeting. it doesn't get completely buried, it gets placed with all the other requirements on the bid documents the GCs must provide, total costs, break down on materials, schedule, whatever whatever, brown M&Ms, whatever.
never seen it done, but I have always wanted to do that. especially on government jobs where you know you are going to get stuck with the crappy low bid, who is going to have so many change orders they come in way over the highest bidder.